Critic Jerry Saltz takes a tour of MoMA this week with architect Liz Diller of Diller Scofido + Renfro, and examines the prospects for the museum’s new expansion project. “This next version of the museum is going to be the best version we’ll get for a while,” he writes. “Which is okay. I can’t live without this museum. I love it. It’s where we all come from — and need to return in order to spawn new ideas of modernism.”